/* eslint-disable no-unused-vars */
var hexcase = 0
var b64pad = ""
var chrsz = 8

function hex_sha1(s) {
  return binb2hex(core_sha1(str2binb(s), s.length * chrsz))
}

function core_sha1(x, len) {
  x[len >> 5] |= 0x80 << (24 - (len % 32))
  x[(((len + 64) >> 9) << 4) + 15] = len
  var w = Array(80)
  var a = 1732584193
  var b = -271733879
  var c = -1732584194
  var d = 271733878
  var e = -1009589776
  for (var i = 0; i < x.length; i += 16) {
    var olda = a
    var oldb = b
    var oldc = c
    var oldd = d
    var olde = e
    for (var j = 0; j < 80; j++) {
      if (j < 16) w[j] = x[i + j]
      else w[j] = rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1)
      var t = safe_add(safe_add(rol(a, 5), sha1_ft(j, b, c, d)), safe_add(safe_add(e, w[j]), sha1_kt(j)))
      e = d
      d = c
      c = rol(b, 30)
      b = a
      a = t
    }
    a = safe_add(a, olda)
    b = safe_add(b, oldb)
    c = safe_add(c, oldc)
    d = safe_add(d, oldd)
    e = safe_add(e, olde)
  }
  return Array(a, b, c, d, e)
}

function sha1_ft(t, b, c, d) {
  if (t < 20) return (b & c) | (~b & d)
  if (t < 40) return b ^ c ^ d
  if (t < 60) return (b & c) | (b & d) | (c & d)
  return b ^ c ^ d
}

function sha1_kt(t) {
  return t < 20 ? 1518500249 : t < 40 ? 1859775393 : t < 60 ? -1894007588 : -899497514
}

function safe_add(x, y) {
  var lsw = (x & 0xffff) + (y & 0xffff)
  var msw = (x >> 16) + (y >> 16) + (lsw >> 16)
  return (msw << 16) | (lsw & 0xffff)
}

function rol(num, cnt) {
  return (num << cnt) | (num >>> (32 - cnt))
}

function str2binb(str) {
  var bin = Array()
  var mask = (1 << chrsz) - 1
  for (var i = 0; i < str.length * chrsz; i += chrsz) bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (24 - (i % 32))
  return bin
}

function binb2hex(binarray) {
  var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef"
  var str = ""
  for (var i = 0; i < binarray.length * 4; i++) {
    str += hex_tab.charAt((binarray[i >> 2] >> ((3 - (i % 4)) * 8 + 4)) & 0xf) + hex_tab.charAt((binarray[i >> 2] >> ((3 - (i % 4)) * 8)) & 0xf)
  }
  return str
}

export default hex_sha1
